Fixes to get all test to run on MacosX Lion 10.7

This includes fixing all utilities to not have any memory leaks,
as safemalloc warnings stopped tests from passing on MacOSX.

- Ensure that all clients takes character-set-dir, as the
  libmysqlclient library will use it.
- mysql-test-run now passes character-set-dir to all external clients.
- Changed dynstr_free() so that it can be called twice (made freeing code easier)
- Changed rpl_global_gtid_slave_state to be allocated dynamicly as it
  includes a mutex that needs to be initizlied/destroyed before my_end() is called.
- Removed rpl_slave_state::init() and rpl_slave_stage::deinit() as
  their job are better handling by constructor and delete.
- Print alias instead of table_name in check_duplicate_key as
  table_name may have been converted to lower case.

Other things:
- Fixed a case in time_to_datetime_with_warn() where we where
  using && instead of & in tests

sql/rpl_gtid.h

@@ -161,14 +161,11 @@ struct rpl_slave_state
   mysql_mutex_t LOCK_slave_state;
 
   uint64 last_sub_id;
-  bool inited;
   bool loaded;
 
   rpl_slave_state();
   ~rpl_slave_state();
 
-  void init();
-  void deinit();
   void truncate_hash();
   ulong count() const { return hash.records; }
   int update(uint32 domain_id, uint32 server_id, uint64 sub_id,